Well, I didn't drill the hole, but it would not affect the system. It wouldn't drain out the water as fast as it would be coming down to the elbo.

By the time I realized it would be OK, I had already put a 4' extension on it and covered everything except for the end.

It rained Thursday. There's about 2 acres of water in the lake. I still have dirt to move; we'll be back at it Monday.